Cross-head



(No Model.)

P. ROBB.

GROSS HEAD.

No. 442,137. Patented Dec. 9, 1890.

gwuemiio'c wi/tmeao Z Q 6 6 UNITE Sarns ATENT OFFICE.

FRANK ROI-3B, OF ST. JOIINS, MICHIGAN.

CROSS- HEAD.

SPECIFICATION forming part of Letters Patent No. 442,137, dated December9, 1890.

Application filed September 2, 1890. Serial No. 363,765. (No model.)

To a/ZZ whom it may concern:

Be it known that I, FRANK ROBE, a citizen of the United States, residingat St. Johns, in the county of Clinton and State of Michigan, haveinvented certain new and useful Improvements in Cross-Heads; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention relates to devices fpr taking up the wear of a piston-rodcross-head.

Ileretofore ithas been the custom to provide removable gibs or braces,or to make the guide-bars adjustable toward each other, for the purposeof taking up the wear incident to the friction of the reciprocatingcrosshead.

The object of my invention is to dispense with all such mechanism andprovide the cross-head with means whereby its wearingsurfaces can bebrought up closely against the guide-bars to make a true joint in a muchmore simple and convenient manner; and with this end in view myinvention consists in the peculiar features and combinations of partsmore fully described hereinafter, and pointed out in the claims.

In. the accompanying drawings, Figure 1 represents a side View of mydevice as applied to the cross-head of a locomotive pistonrod; Fig. 2, atop view of the same, and Fig. 3 a section through 03 a: of Fig. 1.

The reference-letter 0. denotes across-head which travels betweenguide-bars b and is provided upon its opposite sides with integralrunners 0. These runners are movable toward and away from each other,and are re tained upon the vertical faces (1 of the crosshead and heldin true rectangularadjustment by means of guides or dovetails f, rigidlysecured to their under surfaces. These dovetails fit closely withincorresponding grooves made in the sides of the cross-head. The

runners are provided with loeking-screws g, which pass through elongatedslots h and enter the draw-head, whereby the runners may be moved towardand from the guide-bars and held in rigid adjustment.

As an additional means for locking the runners in adjustment, I provideset-screws '1', having heads j and nuts 70, located within recesses l.The nuts 7t bear against one wall of the recess and the heads Z againstthe opposite wall and form a secure fastening device. Now when the topand bottom surfaces of the runners become worn and the cross-head loose,then all that need be done is to loosen the screws 9 and tighten thenuts 7.: with a wrench and then afterward tighten the screws again.Hence it will be easily seen that any required amount of wear can beevenly and perfectly taken up, so that the engine will work smoothly andtruly.

IIavin g thus d escribed my invention, what I claim as new, and desireto secure by Letters Patent, is

1. In combination with a cross-head and runners, means for securing therunners to the cross-head, consisting of transverse grooves in onemember, transverse guides on the other member received by said grooves,and setscrews whereby the parts are held in true rectangular adjustmentand locked in place, substantially as set forth.

2. In combination with a cross-head and transversely-slotted runners,means for securing the runners to the cross-head, consisting oftransverse dovetail guides on one member, transverse correspondinggrooves in the other member, and set-screws passing through the slots ofthe runners and taking into the crosshead, substantially as set forth.

The combination of a cross-head provided upon its opposite sides withpairs of parallel adjustable runners, guides for keeping the runners inrectangular adjustment, said runners being provided with transverseoblong slots, 1ocking-screws passing through the latter, and set-screwsadapted to hold the runners apart, in the manner and for the purposesubstantially as described.

In testimon y whereof I affix my signature in presence of two witnesses.

FRANK ROBE.

Witnesses:

CHARLES M. MERRILL, FRANK. CONN.

